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Engine runs rough service light on change spark plugs wires cap rotor

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Check egr valve sticking open at idle

Posted on Oct 13, 2009

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Replaced engine coil, drove for 50 miles and check engine light starts flashing along with the motor running very rough unless my foot was on the gas petal, replaced EGR valve and still doesn't want to...


cap ,rotor ,spark plug wire , spark plug could misfire....
the check engine light flash because it's a severe misfire and fuel go to converter catalyst.

Sep 29, 2013 | 1998 GMC Sierra

2 Answers

Tuned up car changed 02 sensor full tank of fuel still running rough


Oxygen sensor only report the condition of the engine the rough running condition can range from a worn sparkplug wires to worn sparkplugs to valve problems to injector problems. with the cadillac deville a tune up should be the first attempt to smooth the rough idle with the inspection of the cap and rotor cap and rotor do have a tendancy to arc internally and create misfire so does sparkplug wire that can leak spark voltage to ground and create misfire. the spark plug wire especially if they are brittle and hard can create issues

Apr 23, 2011 | 1990 Cadillac Deville

3 Answers

I fixed my transmission and its still missfiring, what can it be


Tranmissions don't misfire - they are just a bunch of gears.
You're engine can be misfiring - replace the spark plugs, plug wires, and cap and rotor.

Mar 01, 2011 | 1998 Honda Accord

2 Answers

My check engine light was flashing and the engine is running rough


a flashing check engine light indicates a misfire. depending on the vehicle it could be as simple as new spark plug wires

Jan 07, 2011 | Chevrolet Cavalier Cars & Trucks

1 Answer

My 98 Sunfire is idling very rough. How do I check if it's a miss fire or something else. just recently replaced fuel filter and plugs


did you just replace the plugs or replace ignition wires, rotor, and cap (or) ignition coils if applicable? and you check whether its fuel or spark problem by running the engine and taking the plug wire off the spark plug and seeing if there is spark and noting any change in the engine, if the engine runs rough(er) or stalls then you know there is no problem spark related with that cylender, if no change occours when you take the plug wire off the plug then you know there is either a no spark condition (you will be able to see if this is the case) or if there is spark and it is a fuel problem. self explanatory, if everything you test for passes then you probably have internal engine damage. recommended that you use rubber grip pliers when you take the plug wires off while the engine is running, do not ground yourself. Hope this helps! Joseph.

Dec 04, 2010 | 1998 Pontiac Sunfire

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I got an diagnostic and it said the idle air valve is bad.i got it changed but its still runnin rough


A idle speed motor will not cause your engine to run rough.It might idle high or stall. If your engine is running rough check your spark plugs and wires along with your cap and rotor first.

Dec 02, 2010 | 1991 Cadillac DeVille

1 Answer

Engine run rough and miss 3 cylinder


maybe a bad plug switch plugs from 3 to to 2 see does it affect 2

Mar 23, 2010 | 1989 Chevrolet S-10 Blazer

1 Answer

First one minut engine running rough


could be many problems. Do u have a check engine light on in the dash? May also want to check spark plug wires, cap and rotor. Spray them with water while the motor is running, if it acts funny, bad wires or cap/rotor.

I need to know which engine is in ur golf ex: 1.8l 2.0l

Oct 23, 2008 | 1995 Volkswagen Golf

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